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DMSP OLS satellite data provides visible and infrared imagery for monitoring global cloud distribution and cloud top temperatures twice daily. The archive includes low-resolution global and high-resolution regional imagery from a 3,000 km scan, alongside satellite ephemeris and solar/lunar information. Data is sourced from the DMSP Operational Linescan System instruments and archived by NOAA NCEI.
Visible data uses relative values, not absolute radiance. Nighttime imagery switches from telescope pixels to Photo Multiplier Tube (PMT) values. Users must distinguish between high-resolution (0.55 km) fine mode and low-resolution (2.7 km) smooth mode data.